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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf7274a597dd8302d29c175036fe5a81f3883da81ceb8856117eabb654a6244' 
  AND token = 'Q5TtVO20b7a2BRcDdl61Eg9s7+qH0clnpbiqDNzrMKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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