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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764200ec9e0959c14da73c8b4ac3406641a342644f97c3f8d205c69b5d7919af' 
  AND token = 'IgSbdNK/mxIv9ze2zLH5NjNgbulenn+j9T0nmCRCbZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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