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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c282d5c53967f81f7b91d6fcf5d63c1499be18f82beab6601bc72284e8df44c9' 
  AND token = 'Y4+2rQyFKDMVrXqYtVtr7yaCiIBPWkEVRPI18p1d+gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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