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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585c20e3eac55d3ea2fa4144a04161f9c2f556848eb2ae2e4fa38b9c196c411c' 
  AND token = 'vVErHtueCxmOiW+PxLVN9LF3K58v8DbzC9XBNHHy6dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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