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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8fec227c2e1e6264116a95b2ce0efbfee33cd7949501c0c3a66991e6d300389' 
  AND token = 'eMKmYyIvXPZHwLutxVozf4nARUaE3++l2ETeMaSMgUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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