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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b8a20d4214180f89c1f40b375406655f29de1d3408c3f9f538c6c3425f1cda' 
  AND token = '8AB/P/uSS6BxqAuIXibCV8EGFcxuKR2iEeF/Y62aJ7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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