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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951f133d36e4bca45a7cfb33787c28a2078dfe34598418c118d7c4d70ecc7a07' 
  AND token = '5LJKXWjHQzW6ymc0O/7q8BltgAjche7/5J41TYjcdZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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