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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9689d8d6aa04f8d6b2dddeb9173056565792eec7ad1d6b35dd0f23f27d7eb799' 
  AND token = 'tjU6Dh6fRQsSCzQIRxCiUigGj5wS+HEngV6t+3G15R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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