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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcea4787de82fee640448a06e6f29796300bf7f67c14e196f4b8e757bd7ab440' 
  AND token = 'O4XEv0s5C/TMoTUEzCp7kRZSM7LKFwk00x857hPMUog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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