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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55a169b5809391d82a586c5502e9cdf8e0fdcdbc1839c87ee20856c308c9db9' 
  AND token = '9z+GW6IWI8QpgEaiy2+ZgWHkxoaVh97k5qODcW1bLh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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