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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29624a0490b4735aaa943636866be4251680e03ebc33b4792e4084d2345a2a15' 
  AND token = 'JqgPfbRR/HIZan3j3jVXIEWjMaJDub2Lxww4AR+sjZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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