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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db52bbb45563dd2f61125b563d11e28bb5dd951d12679102cfc97d5228b0c7b7' 
  AND token = '2PIgMcBRBX23QW2v88yr44AfIs7YpAatKG9F6eLZWWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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