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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6186e93f473fe446425e2876c5daba57604ebe7df5f34e92793004a84855b64' 
  AND token = 'AKbFboV3cJ2JR7foYR9kJvR2BB6zGIYJz0bbmK7MTO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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