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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b733d99d425baa9e255eba7ec71c9342f1aa3f4da8a4688151ea5b8b6c5e996c' 
  AND token = 'XiDNn7zLFpA4mUAZjhJUGFiwlUVbpmb71zFjxTgmics=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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