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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee0b4e8eca13eb7086180283ec1a98577bdded0548bc0f18669fd57f4e3188c' 
  AND token = '6P4S9MHsLMSJzPzxOSOUc7t4RLf8o9sgFQW1yYqn9Js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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