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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d638a036be478cd86ff77be03a7b3fc031ae6df2f2eaf8831888a838135b64c' 
  AND token = 'YtgrsQ/B7gl1nsddtX9XYWgmJ3uUzGEwbZ5SNKx63Sk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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