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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621ca890bafd047af1febc6e87529ca7bab78c9b1aa558817281a2328822aea4' 
  AND token = 'a4fCr1VhOgQUg3u1+5qSN61omR55usrDhoeXFGBkYBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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