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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f940662481593379b6d36d2dec51633b0f1a37066c41bf9687600952e738867' 
  AND token = 'jS8fU98lYkxlW40pynl5QGaa6Q279viy/gKJWB4iG0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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