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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2f03c76207ad3061b1c6543867e8ccc1db90b8489db70caf6a5ca787e657fb' 
  AND token = 'fB7ABIro2SyEobJvPaC7bCPEm2G22L2ftgo9PwZCgDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}