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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca27c4501e6a5cba44a8a0d5b5a5473688639049873831c195578b24b4a41b4' 
  AND token = 'ip04IFYpXN0JDPSJ8VPSGzEoua4JNQg7r+O6WMElC3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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