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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27964e78048a6837d1bd5c4169c7eb25e7a3945427c06b0debd7b8a56f26b912' 
  AND token = 'KJsgEW7c35pUBYaDhJhk4ky8payIjHsSIMxWksR+pIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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