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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c83b3b119be17eec865714de02f66d51663088d4824b94cedb2a29a977ec414' 
  AND token = 'V7ZMnPmTvFVxUrr3VgxrY0eRNUoFQTIgY3p9j18IjR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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