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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f81880d3ac3b80887e487f352f9cfdf3454dc6f69d8566c19f8651286bbb87a' 
  AND token = 'g50sewu+9MDARL4BduBcOpi8IX7GmZB3TNB9cUfttkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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