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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e12c117d8944f2e73cc6708f569a6ba4b85548b42146ddb3a3dc072db7c50933' 
  AND token = 'nA08RyeWZLwjFCpiH+MpClBK629JKdd7awAtXtWRk68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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