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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b617325e5b43fd7d13eaef9302c0dc465472322d77080a788eaecdc3a957bf49' 
  AND token = 'GE6npfHEjx25AFW9yuXdB10hQCI0yW39mDiMVH5czpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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