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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600abc6c6fdbe914ca787f97e87e7d4e926dae5d9034f185cd11d9a846a5b561' 
  AND token = 'UcG+g+IQG37f+ocXynYIATCp4E4pkWY/kHKgO5qnUEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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