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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab0c16a927e1c89d06a8d686ce919deed8545c78e1bc0600db4c1d99614c6ca' 
  AND token = 'p0JyiQT79HRlJFRghzfRc+pEuCYaP/8Wu8Gggz+Vq5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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