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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85886a53cb026fc9894c4239f2167415d87f719ae1993d550099f33f65531bdd' 
  AND token = '2cnyYs40ebViPFlfaEOegZIM68qxNv59RJuF2Bj8ga4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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