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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '291b3324b40c61037448c4788156f5c114d57745d081092684b86ea4a60ebd07' 
  AND token = 'pEfCgEuZdbrMLVIXEgXmBwsa4L5jlGabCoIJHc8TG7o=' 
  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"
    }
  }
}