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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae6d7b0bb92a09c034aab1f8390b6374d75df64fb9922e90559aeabbe58bf5e' 
  AND token = '9t4eHvJwlnweu5qY5z4uvZdPp06g7BoLVqQoN/ecy9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.02486

JSON explain

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