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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e11742ba40834589d85b9077cc3533ae717a89f377be6ff5af5e89fb05a17909' 
  AND token = 'Ncjoj6cT8+X5EVVxgGgrUqi/NpaMkCJucU+gV8lOJmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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