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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9872b445793bd927c3ac7343e1d8bc3334545cf71c741df9546cbca5dc900d45' 
  AND token = 'HhppRAWwU4vJcRol8+UvYlhvy/2bgJ0p/y0n9Gk41eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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