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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6316f9a01c7a0ea63f03661e6e075e93714d24422e48d2c2c3b21ad0a7895957' 
  AND token = 'rWxXBNc6AMrnIih/U2MDM2r0mjGqswMQbczPnX91M5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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