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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f037df86188f207684d02f0a8c425593a3db3bccb8dea7c9aaf9e9a4e4f38d2e' 
  AND token = 'jOS3OH/mIPCEjlA6spwMlXUJx96W7Zj3LFE/nUtA6RM=' 
  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"
    }
  }
}