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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c5cb852098f5b246dd3b6bfd61040ad9be9fa72efa9c883c9a89c1c7a2558f8' 
  AND token = 'gEFwbaGQX6Um04aCYmjvxX45T+9LNRyo4FMAaXPwTjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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