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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc9c035cddc3a694b2677471d7eeced93724497e9e74e53ac268853b65d5e0a' 
  AND token = 'bMCiQtr7zFvTeHI1rI2XLx0nWQgsd7kxJXHqUFw0ocE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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