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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7ef132a9a77c8375037ab225e0af32e4ff927653f81a46c6e087a2588063ab' 
  AND token = 'ZrEntOg1wIN9UoR0BPvl08wFuBbaGV5lfaseEHt8yNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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