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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee36b4336ff2c644775ab8847551ad5aae515d922e809ffe639ea7d49d6d6ee' 
  AND token = 'cQf6ZV/rphVx4QZLiYWc23I0wa1vmPblTmS+L1yvmFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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