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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '066292a56ce0e4b8fe2aa3d6c2084ec043a25741dc5bd9fd73aac96eb7058082' 
  AND token = 'yvaSuJpqDkGtbl/7PEZ6LUWw9MjXkN3P/N++fUJPjjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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