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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8f6b3f12690c2e2f3746af79282709da188bcc8f84c0dc27fc76f4447d76218' 
  AND token = '68lQox0G+H4+TfOVPG5RYkSlqvOQ43Ne8UZGjvkmtUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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