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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f451bae34f28baa0033207e6d743231796821cc51e670539c1a7568cd357c9a2' 
  AND token = 'yRo9ErFWkKB+xoNZFfDslgtAIuc6+d5cy5oml/wQRm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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