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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9286d88b86b21f2b89155cab73698883a2ff0f9f4dc72dd1fdb4b903f731fc9a' 
  AND token = 'LYCRVr0PSBDxs4V5e36LjiSiyFM6er4FwWxqtWcIOlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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