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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf5e78d183a06b7c157db570ce81a85febbc25b7d9d59831e9ac0de2f5fa87b' 
  AND token = 'x75ziK2P4x8bJG0gH/XnLaBnFirn8DUIPLIPKbRAXNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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