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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c380aa5a42807516d288202934e0537e5cc822628122f08151a5e511c55954' 
  AND token = 'kHEUO6+8VW0xTJRsw37P/s8HlciXIlNisEGRK4Bj2lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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