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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dee1cd8554a09bb4031802dec71e9d5e9e333cc8dcb48f6035dbf22602117dd2' 
  AND token = '1uW7pqHqWfWP7GokASrcV/6c8EeRZ64XYXliPEM/4PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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