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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e087882a43ab995c1d6d5d4804769d3b3ca3875ed1cc727a12824ddd98b7904' 
  AND token = '7SPI2Fy4+KNMazBan8qQ7Vk+1fZ3wk/vJ4KOOPdGvI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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