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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c21e6bd4ee99dedd8463e2b1d037554bed86700b7c20fe8bdc35bbb22b68bf' 
  AND token = '56NhkS86fbYRtStqjeh3hRbS2aqqqezb2uX/3Yn4Z3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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