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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b3c1af588b2ae03eb0155a056959fe2f64bc650b15152c1015c4ff44bfa6909' 
  AND token = 'nCD2h//CVxvWEirrnN1PuQ/pNg0bc+ZeLhvVHkXzUuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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