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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39001bd725f531ea503dc2ce1b3b864637d386846c54f4c71f67ad51d97d810c' 
  AND token = '/votFa9xfvM+v1mOYP304GKBcrha1YbFX43/NJtQ8Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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