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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25d45a558d8df623df1d27a535ca2b1e7f8a731b2d6df863644fdbe795c51a7' 
  AND token = 'S6PEEJld3TpmaxjOSY2U/h8N+FTs8rC8Xlt+wLc8sHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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