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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8704ea99fa750c7e66387038eb4ee13fab36c9d03b7db0f2d79ac8e27200344' 
  AND token = 'MbfvH6fv+5G24Ek/Dndg7K1NgSuJhkg45VB24q+Uz0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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