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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7e2c2d57f3ed4f8bb592fd605bb251de92bc08259587273bde729d233dcb6e' 
  AND token = 'INGG4vCUVy86lIZN2lh62/SPE3EjdiBniWEeMzlr1xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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