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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb5d1c100e6aa58a8f962c4cdea715147418ebd26c03b565d5b444071f676de' 
  AND token = '8I3RTFYNF02b/F8ynWF5HDaajcgjRCyhxtazUI3dkA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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