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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b384af9a8e4de4b4c3c1a6521d90417ea8ab049382ed4ebc779dd457f450950a' 
  AND token = '3xUb3VCabnq5lLTiwVI35CQj6Ps0MZ3rVmxewxI+5z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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