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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5250902be1095fb84a6579cefa8de3019f4f666b0b70b004e0d8e87d23abd5d1' 
  AND token = 'tKGeDlgLXw6IMJZ+6yAaeeswiebNDGt8ayYGIEw6il8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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